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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1446f57eb362d13748064e18c19bbecb909e39643baa6b6b60c7624adf7f77' 
  AND token = 'fj52xPu6jeNTY1G5w8FdKs7Z2+uqQ5AU5W6qS/KTk6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}